6.6 sha2 utilities: Print or check SHA-2 digests

The commands sha224sum, sha256sum,
sha384sum and sha512sum compute checksums of
various lengths (respectively 224, 256, 384 and 512 bits),
collectively known as the SHA-2 hashes. The usage and options of
these commands are precisely the same as for md5sum.
See md5sum invocation.

Note: The SHA384 and SHA512 digests are considerably slower to
compute, especially on 32-bit computers, than SHA224 or SHA256.